Reaction of Allenyl Esters with Sodium Azide: An Efficient Synthesis of <i>E</i>-Vinyl Azides and Polysubstituted Pyrroles
作者:Xian Huang、Ruwei Shen、Tiexin Zhang
DOI:10.1021/jo062376m
日期:2007.2.1
The nucleophilic addition of sodium azide to 1,2-allenyl esters can generate vinyl azides in excellent yields with excellent regio- and stereoselectivities. Moreover, pyrroles are synthesized using 1-allyllic 1,2-allenyl esters as substrates in t-BuOH at 65 °C. The sequential reaction for pyrroles is developed on the basis of a novel domino process involving nucleophilic addition, cycloaddition, denitrogenation
Olefin-Directed Palladium-Catalyzed Regio- and Stereoselective Oxidative Arylation of Allenes
作者:Can Zhu、Bin Yang、Tuo Jiang、Jan-E. Bäckvall
DOI:10.1002/anie.201502924
日期:2015.7.27
An olefin‐directed palladium‐catalyzedoxidative regio‐ and stereoselective arylation of allenes to afford 1,3,6‐trienes has been established. A number of functionalized allenes, including 2,3‐ and 3,4‐dienoates and 3,4‐dienol derivatives, have been investigated and found to undergo the olefin‐directed allene arylation. The olefin moiety has been proven to be a crucial element for the arylating transformation
Efficient syntheses of 6-prenylcoumarins and linear pyranocoumarins: Total synthesis of suberosin, toddaculin, O-methylapigravin (O-methylbrosiperin), O-methylbalsamiferone, dihydroxanthyletin, xanthyletin and luvangetin
作者:Raghao S. Mali、Priya P. Joshi、Paramjeet Kaur Sandhu、Anita Manekar-Tilve
DOI:10.1039/b109597h
日期:2002.1.23
Synthesis of naturally occurring 6-prenylcoumarins (1a, 2c and 3a) and their derivatives 1c, 1d, 1e, 2d and 3b–d starting from 2-prenyloxybenzaldehydes (8, 12 and 14) using tandem Claisen rearrangement and Wittig reaction is described. The coumarins 1a, 1e and 2c are converted to dihydropyranocoumarins (5a–e). The conversion of dihydroxanthyletin 5a and dihydroluvangetin 5d to the naturally occurring linear pyranocoumarins xanthyletin 6a and luvangetin 6b is also described.
Efficient synthesis of 6-prenylcoumarins; total syntheses of suberosin, toddaculin, O-methylapigravin (O-methylbrosiperin) and O-methylbalsamiferone
作者:Raghao S. Mali、Paramjeet Kaur Sandhu、Anita Manekar-Tilve
DOI:10.1039/c39940000251
日期:——
Synthesis of naturally occuring 6-prenylcoumarins 1a, b, 2c, and 3b and their derivatives 6a–c is described, starting from 2-prenyloxybenzaldehydes 4a–c, using a tandem Claisen rearrangement and Wittig reaction.
Synthesis of the naturally occurring prenylated coumarins balsamiferone and cedrelopsin by domino reactions
作者:Rupesh E. Patre、Perunninakulath S. Parameswaran、Santosh G. Tilve
DOI:10.3998/ark.5550190.0012.905
日期:——
Regioselective one step synthesis of naturallyoccurring prenyl coumarinbalsamiferone is described using domino Wittig reaction, 3,3-sigmatropic rearrangements and deprenylation, while regioselective synthesis of cedrelopsin is described via domino Wittig reaction, prenylation and deprenylation..